The stall could be a cause or a result. Do you know which?
The phase loss often senses ripple voltage on the bus, so a stall could do that, although the thing should not be able to do that, it should not get that ripple voltage at max current.
If it shuts down for .ripple voltage that will stall it, of course.
Might have a bad solder joint on a bus capacitor, or just a bad capacitor.
If it is rare, don't worry for now. Or reduce max current setting a bit.
That's exactly what's going on here. The Delta drives, as many other do, use the ripple current as a way to detect a phase loss. But ripple current has a lot to do with the capacitor capabilities, so when the current goes above the recommended de-rating for single phase input, the capacitors can no longer support the DC bus and the ripple increases, triggering the phase loss.
In the Delta VFD-B series however,
there is no "de-rate" formula from Delta, in fact this is what the manual says:
Do NOT connect 3-phase models to a 1-phase power source.
I happen to know from direct experience with Delta however that they CAN work, but NOT with the "50% de-rate" as some VFD mfrs claim,
they need a 65% de-rate (meaning motor FLA / .35) because of the way the capacitors are designed. So for a .75kW motor, you needed a 2.2kW drive. Now that you have already bought that 1.5kW drive, and if you are not inclined to try to use it somewhere else and buy the right size, you will have to live with this "unintended feature".
One thing you can try is to change the values of parameters 06-01 and 06-02, which are the "Stall Prevention" attributes; 06-01 is during acceleration, 06-02 is during running. The factory defaults are set for 170% of the programmed motor FLA. Because of your under-rated drive situation, you can lower that to something closer to 100% of FLA. What this does however is to automatically lower the output frequency in order to attempt to shed load. That may or may not have negative consequences to a machine tool operation, i.e. your cutting speed may drop really fast and affect the cut quality. It also may not actually work because it is a Constant Torque application.
The other thing you could do is to program the Over Torque settings (par. 06-03 thru 5) to trigger one of the the Muti-Function Outputs and connect it to a warning light, telling you that it is ABOUT to trip so that you can back off on your bite.
Side note: the MAIN issue with de-rating for single phase on any VFD is actually the CAPACITORS, not the diode sizing as many people seem to think. So "sharing" across more diodes does nothing useful in that regard.